command-not-found: Improve documentation

Changed files
+6
nixos
modules
programs
command-not-found
+6
nixos/modules/programs/command-not-found/command-not-found.nix
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description = ''
Whether interactive shells should show which Nix package (if
any) provides a missing command.
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Requires nix-channels to be set and downloaded (sudo nix-channels --update.)
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See also nix-index and nix-index-database as an alternative for flakes-based systems.
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Additionally, having the env var NIX_AUTO_RUN set will automatically run the matching package, and with NIX_AUTO_RUN_INTERACTIVE it will confirm the package before running.
'';
};